[Webkit-unassigned] [Bug 276845] New: [GTK] Janky repainting while resizing browser window, and GPU artifacts on open source AMD graphics

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=276845

            Bug ID: 276845
           Summary: [GTK] Janky repainting while resizing browser window,
                    and GPU artifacts on open source AMD graphics
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nekohayo at gmail.com
                CC: bugs-noreply at webkitgtk.org

Created attachment 471917

  --> https://bugs.webkit.org/attachment.cgi?id=471917&action=review

Video demonstration

Testing Epiphany 47 TP / nightly (WebKitGTK 2.45.5 / GStreamer 1.24.5 / GTK 4.15.4), and any previous version, if you resize the window, the resizing is very janky even on Wayland: contents visibly repaint slowly compared to the mouse movement, etc. Generally, I've observed this both on Intel and AMD open source graphics.

While the jank is not necessarily accompanied by artifacts while testing on my laptop with Intel Kabylake graphics, it is full of artifacts when testing on open source AMD graphics on Wayland; WebKitGTK browsers' web views are affected in this way, but pure GTK4 applications (such as Nautilus) have completely smooth resizing with no artifacts.

Attached is a video showing this with AMD graphics.

This GPU is an AMD Radeon R9 270 with Mesa 23.3.6 on Fedora 39.

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